Abstract
Organic thin-film transistors (OTFT) are excellent candidates for the application on disposable sensors due to their potentially low-cost and easy fabrication process. Two types of OTFT-based sensors have been studied. One is light sensitive phototransistor based on the composite of poly(3-hexylthiophene) and TiO2 nanoparticles. The device shows a quick change of channel current under light exposure, which can be attributed to a positive shift of the threshold voltage induced by accumulated electrons trapped by the TiO2 nanoparticles in the channel. Another one is for sensing DNA hybridization. Both single and double strand DNA molecules are immobilized on the surface of the Au source/drain electrodes of different devices, inducing a dramatic change in the performance of the OTFTs. Single strand DNA and double strand DNA are differentiated successfully in the experiments indicating that this is a promising technique for sensing DNA hybridization without labeling.
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